Offer concrete examples of how you can help
Applicant A came into the interview, answered the routine questions, and then left.
Applicant B came into the interview, answered all the questions, but gave a few actual examples of how he could help the company.
Guess who got hired?
The key in a sales interview is doing your research. A couple of hours’ worth of research about the company will show you what kind company it is and how you feel you can contribute to it. In the job interview, introduce an problem you see in the company and more importantly, show how you can help fix it. Employers appreciate the extra effort you put in and will be more amenable to hiring you, because you not just already know what the company needs, but also how you can actually contribute to the company.